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Behaviour of SQL Server after Windows Security patching
Hi Team, Can any one tell what affect can hapen to SQL Active Active cluster After Windows Security patching. Windows team are going to update the security patch on our Active Active cluster. Do i need to bring the node offline before the patching. or i can stop the service of SQL service. Do Stoping the Sql server will not affect the fail over . Thanks Basit khan
You mention Active/Active cluster, by this I presume that you are running two SQL instances on a two node cluster. If this is the case here are the steps I recommend for patching Windows: 1. Failover InstanceA to ServerB (this leaves InstanceA & InstanceB running on ServerB) 2. In Failover Cluster Manager pause ServerA 3. Apply Windows Patches to ServerA and reboot 4. Unpause ServerA 5. Failover InstanceA & InstanceB to ServerA 6. Test to ensure that you have no problems/issues 7. Pause ServerB 8. Patch ServerB and reboot 9. Unpause ServerB 10. Failover InstanceB to ServerB 11. Done
In my Active Active cluster there are 3 instance and all are running on one node, No instance are running on the Second node. So it mean that all the instance should be failover to other node. abd then after patching on that node bring all the instance on the patched node and then i can go for patching for next node...
Personally, I'd take the node offline for patching like this. Also, I'd make sure I had a good backup in place before hand (good = tested recovery). Depending on how you stop SQL Server, it can cause a failover, so be sure you use the Cluster Manager software to stop the service if that's what you're going to do.
In my Active Active cluster there are 3 instance and all are running on one node, No instance are running on the Second node. So it mean that i can bring all the 3 resource offline on that node and they can go for patch that node. like let i have 3 instance 1,2, 3 on 2 node A & B 1. Failover Instance 1,2,3 on server B 2. Offline the resoucre on Server B 3. Patch the Server A, Reboot server A. 4. Failover Instance 1,2,3 on server A 5. Offline the resoucre on Server A 6. Patch Server B, Reboot Server B 7. Now after all the patching bring online all resource on Server A. is this a correct methord. Please suggest me.
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